Absolute cross sections for photoionization of Xe$^{q+}$ ions (1 $\le$ q $\le$ 5) at the 3d ionization threshold

• Main Authors: Schippers, S, Ricz, S, Buhr, T, BorovikJr, A, Hellhund, J, Holste, K, Huber, K, Schäfer, H. -J, Schury, D, Klumpp, S, Mertens, K, Martins, M, Flesch, R, Ulrich, G, Rühl, E, Jahnke, T, Lower, J, Metz, D, Schmidt, L. P. H, Schöffler, M, Williams, J. B, Glaser, L, Scholz, F, Seltmann, J, Viefhaus, J, Dorn, A, Wolf, A, Ullrich, J, Müller, A
• Format: Journal Article
• Language: English
• Published: 11-04-2014
• Subjects: Physics - Atomic Physics
• DOI: 10.48550/arxiv.1404.3021

J. Phys. B. 47 (2014) 115602 The photon-ion merged-beams technique has been employed at the new Photon-Ion
spectrometer at PETRA III (PIPE) for measuring multiple photoionization of
Xe$^{q+}$ (q=1-5) ions. Total ionization cross sections have been obtained on
an absolute scale for the dominant ionization reactions of the type h\nu +
Xe$^{q+}$ $\to$ Xe$^{r+}$ + (q-r) e$^-$ with product charge states q+2 $\le$ r
$\le$ q+5. Prominent ionization features are observed in the photon-energy
range 650-750 eV, which are associated with excitation or ionization of an
inner-shell 3d electron. Single-configuration Dirac-Fock calculations agree
quantitatively with the experimental cross sections for non-resonant
photoabsorption, but fail to reproduce all details of the measured ionization
resonance structures.